CN101422720B - Absorption filtration dearsenication method based on in-situ composite metal oxides generation - Google Patents

Abstract

The invention belongs to the field of materials for adsorbing and removing arsenic in water, in particular to an in-situ-generated composite metal oxide arsenic-removing adsorbent based on iron oxide, manganese oxide and aluminum oxide and its application method, especially in the removal of arsenic in drinking water Applications. The present invention adopts the in-situ preparation method to prepare the in-situ generated composite metal oxide arsenic-removing adsorbent, which is composed of hydrated iron oxide, hydrated ferric oxyhydroxide, hydrated aluminum oxide, hydrated aluminum oxyhydroxide, hydrated manganese oxide and the like. The present invention provides an in-situ composite metal oxide arsenic-removing adsorbent that can be used to remove arsenic in drinking water, groundwater, and industrial wastewater, and can also be used to remove arsenic pollutants in lakes, reservoirs, rivers, and other water bodies; in addition, the adsorbent It can also be used to adsorb and remove heavy metals such as copper, chromium, cadmium, lead, and pollutants such as iron, manganese, and phosphate in water.

Description

A method for removing arsenic by adsorption and filtration based on in-situ generation of composite metal oxides

technical field

The invention belongs to the field of materials for adsorbing and removing pollutants such as arsenic in water, and particularly relates to an in-situ generated composite metal oxide adsorbent for removing arsenic based on iron oxide, manganese oxide, and aluminum oxide and its application method, especially for drinking The application method in the removal of arsenic from water.

Background technique

Arsenic is a highly toxic heavy metal element, and its presence in the environment will have a serious impact on the human body, aquatic animals and plants. In addition, if arsenic-containing water is used for agricultural irrigation, fishery, landscape and other functional needs, it may also enter the human body indirectly through the enrichment of the food chain and pose a threat to human health. Drinking water with excessive arsenic for a long time may lead to a series of health problems such as skin pigmentation, skin keratinization, skin cancer, liver cancer, and cardiovascular disease. In order to control the risk of arsenic exposure to the human body caused by drinking water, food, vegetables, fruits, aquatic animals (such as fish), etc., my country has strictly regulated the concentration limit of arsenic in different water environments in the form of standards. For example, the water environment quality standard requires that the concentration of arsenic in water bodies of four types and above should be lower than 50 μg/L; the industrial wastewater discharge standard stipulates that the concentration of arsenic in industrial wastewater discharged into water bodies should be lower than 0.50 mg/L. In addition, my country's latest "Drinking Water Hygienic Standards" (GB5749-2006) has made stricter regulations on the limit of arsenic concentration, requiring that the maximum concentration of arsenic in drinking water must be lower than 10 μg/L.

、READ-As

、锰砂、水合锰氧化物、氧化铁-氧化铝复合纳米材料、铁锰复合氧化物/硅藻土等材料。例如，李圭白等人前期申请的铁锰复合氧化物/硅藻土吸附材料(专利申请号：200610008135.8)能够充分实现三价砷(As(III))的氧化与五价砷(As(V))的吸附，从而表现出优异的吸附除砷能力。蔡亚岐等人发明的氧化铁-氧化铝复合纳米材料(专利申请号：CN200710118307.1)颗粒粒径细小、比表面积很大，从而表现出很强的去除水中砷等污染物的能力。The hot and difficult issues of domestic and foreign research on arsenic removal technology in water. In the past ten years, tens of millions of people have been exposed to arsenic through drinking water due to arsenic pollution in groundwater in the Ganges Delta region, and millions of people have suffered from arsenic poisoning symptoms. For this reason, a lot of research and technology development work has focused on the removal of arsenic in drinking water, and developed a large number of new technologies and methods for removing arsenic, such as adsorption, flocculation-precipitation-filtration, flocculation-direct filtration, electrodialysis, ion exchange, Membrane separation, etc. On the arsenic removal adsorption material, developed activated alumina, red mud, modified activated carbon, iron oxyhydroxide, GFH

, READ-As

, manganese sand, hydrated manganese oxide, iron oxide-alumina composite nanomaterials, iron-manganese composite oxide/diatomaceous earth and other materials. For example, the iron-manganese composite oxide/diatomite adsorption material (patent application number: 200610008135.8) previously applied by Li Guibai et al. can fully realize the oxidation of trivalent arsenic (As(III)) and the oxidation of pentavalent arsenic (As(V)). The adsorption, thus showing excellent adsorption capacity for arsenic removal. The iron oxide-alumina composite nanomaterial (patent application number: CN200710118307.1) invented by Cai Yaqi and others has a small particle size and a large specific surface area, which shows a strong ability to remove arsenic and other pollutants in water.

In the process of removing arsenic from drinking water, the above materials are often filled in the adsorption tank, and the arsenic pollutants can be adsorbed and removed from the water phase when the arsenic-containing water flows through the adsorption tank. The method of filling the adsorbent in the adsorption tank to form an adsorption unit is easy to implement in small-scale arsenic removal projects in rural areas, and the equipment operation, management and maintenance are simple. However, for arsenic removal systems with a processing scale of tens of thousands to hundreds of thousands of tons per day, this method often requires a large number of adsorption tanks, which not only greatly increases the investment cost of the system, but also significantly increases the system operation and regeneration. the complexity of operations. The in-situ generated arsenic removal adsorbent is used to adsorb arsenic in water, thereby converting dissolved arsenic into particulate arsenic, and then the particulate arsenic is removed from the system through a filter unit. This arsenic removal method has simple process and convenient operation, and has strong comparative advantages especially for large-scale arsenic removal systems. The composite oxidation flocculant (patent application number: 200610008135.8) invented by the applicant in the early stage is composed of potassium permanganate and ferric chloride, which converts As(III) into As(V) through oxidation, and then passes through the flocculation reactor, composite Double-layer filter columns and/or ultrafiltration membrane filters remove arsenic from the system. However, the dosage of the oxidant potassium permanganate in the composite oxidation flocculant is mainly determined by the concentration of As(III) in the water, and is the equivalent dosage of As(III) in the water. Under this condition, the optimal composition ratio between manganese oxide and iron oxide can be brought into full play, so as to obtain a more excellent arsenic removal effect. In addition, the use of composite oxidation flocculants to remove arsenic requires flocculation reactors, composite double-layer filter columns and/or ultrafiltration membrane filters and other reactors. There are too many reactors, too much capital investment, and water volume and pressure adjustment between different units. It is too complicated to be used in large-scale arsenic removal water plants.

Therefore, the development of highly efficient, low-cost, easy-to-use arsenic-removing adsorbents and arsenic-removing methods for drinking water that can meet the needs of large-scale arsenic removal is a difficult problem that needs to be solved urgently in current research and engineering applications.

Contents of the invention

One of the objectives of the present invention is to provide an in-situ generation compound with high performance, economical feasibility, and easy large-scale application in engineering for arsenic pollutants in water, especially arsenic in large-scale drinking water arsenic removal water plants. Metal oxide arsenic removal adsorbent.

The second object of the present invention is to provide a preparation method for in-situ generation of composite metal oxide arsenic removal adsorbent.

The third object of the present invention is to provide an application method for in-situ generation of composite metal oxide arsenic removal adsorbent, and a corresponding reactor.

The principle of the arsenic removal technology for the in-situ generation of composite metal oxidation arsenic removal adsorbents involved in the present invention is: hydrated iron oxide (Fe ₂ O ₃ ·xH ₂ O) with excellent arsenic removal performance, hydrated iron hydroxide (Fe (OH) ₃ ·xH ₂ O), hydrated ferric oxyhydroxide (FeOOH·xH ₂ O), hydrated aluminum oxide (Al ₂ O ₃ ·xH ₂ O), hydrated aluminum oxyhydroxide (AlOOH·xH ₂ O), Hydrated aluminum hydroxide (Al(OH) ₃ xH ₂ O), hydrated manganese oxide (MnO ₂ xH ₂ O), hydrated manganese hydroxyhydroxide (MnOOH xH ₂ O), etc. Compounding is carried out to obtain an in-situ-generated composite metal oxide arsenic-removing adsorbent with abundant active adsorption sites and surface hydroxyl groups. In the process of adsorption and removal of arsenic, the oxidation, adsorption, and surface complexation of the surface active sites of the arsenic removal adsorbent are used to realize the separation of arsenic from the water phase and its solidification inside the adsorbent; the adsorbent that adsorbs arsenic and the arsenic pollution The substances are filtered and removed from the water in the filter unit to be purified. The arsenic-removing adsorbent is used to remove arsenic in drinking water sources, and the treated water can meet the limit requirement (<10 μg/L) for arsenic in the latest National Sanitary Standard for Drinking Water (GB5749-2006). The arsenic-removing adsorbent can also effectively remove arsenic pollutants in water bodies such as rivers, lakes, reservoirs, groundwater, and industrial wastewater; in addition, the adsorbent can also be used to adsorb and remove heavy metals such as copper, chromium, cadmium, and lead in the above-mentioned water bodies and Iron, manganese, phosphate and other pollutants.

The in-situ composite metal oxide arsenic-removing adsorbent of the present invention is prepared from iron salt solution, aluminum salt solution, ferrous salt solution and permanganate solution through chemical reaction. The composite components of the in-situ composite metal oxide adsorbent for arsenic removal include hydrated iron oxide (Fe ₂ O ₃ ·xH ₂ O), hydrated iron hydroxide (Fe(OH) ₃ ·xH ₂ O), hydrated hydroxyl Iron hydroxide (FeOOH xH ₂ O), hydrated aluminum oxide (Al ₂ O ₃ xH ₂ O), hydrated aluminum oxyhydroxide (AlOOH xH ₂ O), hydrated aluminum hydroxide (Al(OH) ₃ xH ₂ O), hydrated manganese oxide (MnO ₂ ·xH ₂ O) and hydrated manganese hydroxyhydroxide (MnOOH·xH ₂ O), etc., where X is the number of water molecules.

The above-mentioned in-situ composite metal oxide adsorbent for removing arsenic can be further compounded with components such as sodium silicate, sodium polysilicate, sodium polyphosphate, sodium phosphate, polyacrylamide (PAM).

In the above-mentioned in-situ composite metal oxide arsenic removal adsorbent, it can further be compounded with diatomite, kaolin, red soil, red mud, clay and other components. Wherein, the particle size of the above materials is below 100 mesh.

The iron salt can be selected from one or more than one mixed salts of ferric chloride, ferric sulfate, ferric nitrate, polyferric chloride, polyferric sulfate, polyferric nitrate, etc.

The aluminum salt solution is selected from one or a mixture of more than one of solutions such as aluminum sulfate, aluminum chloride, polyaluminum sulfate, polyaluminum chloride, aluminum nitrate, polyaluminum nitrate, and alum.

The ferrous salt solution includes one or more than one mixture of ferrous chloride, ferrous sulfate, ferrous nitrate and other solutions.

The permanganate solution includes one or a mixture of potassium permanganate, sodium permanganate and other solutions.

In the above-mentioned aluminum salt, iron salt, ferrous salt, permanganate solution, one or more than one mixed salt solution of calcium salt and magnesium salt can also be added; (or iron salt, ferrous salt, permanganate) molar ratio is 0 to 1:1, the molar number of magnesium salt and aluminum salt (or ferric salt, ferrous salt, permanganate) molar ratio The ratio of numbers is 0 to 1:1. Can also add manganese salt solution in above-mentioned aluminum salt, iron salt, ferrous salt solution; The ratio of the molar number of general manganese salt and the molar number of aluminum salt (or ferric salt, ferrous salt, permanganate) is 0～2:1.

The calcium salt can be selected from one or more than one mixed salts of calcium chloride, calcium sulfate, calcium nitrate and the like.

The magnesium salt can be selected from one or more than one mixed salts of magnesium chloride, magnesium sulfate, magnesium nitrate and the like.

The manganese salt can be selected from one or more than one mixed salts of manganese chloride, manganese sulfate, manganese nitrate and the like.

Components such as described sodium silicate, sodium polysilicate, sodium polyphosphate, sodium phosphate, polyacrylamide (PAM), any one of it and aluminum salt (or iron salt, ferrous salt, permanganate) The mass ratio is 0-0.5:1.

The mass ratio of diatomite, kaolin, red soil, red mud, clay and other components to aluminum salt (or iron salt, ferrous salt, permanganate) is 0-1000:1.

The preparation method of the in-situ composite metal oxide arsenic removal adsorbent of the present invention is prepared by an in-situ preparation method, wherein:

1. Preparation of in situ composite metal oxide adsorbent for arsenic removal by ex situ preparation method

Prepare mixed solution A and mixed solution B respectively in one of the following ways:

1) Mixing iron salt, aluminum salt and ferrous salt solution to obtain mixed solution A, using permanganate solution as mixed solution B;

2) Mixing aluminum salt and ferrous salt solution to obtain mixed solution A, mixing ferric salt and permanganate solution to obtain mixed solution B;

3) Mixing ferric salt and ferrous salt solution to obtain mixed solution A, mixing aluminum salt and permanganate solution to obtain mixed solution B;

4) Mix the ferrous salt solution to obtain a mixed solution A, and mix the aluminum salt, iron salt, and permanganate solutions to obtain a mixed solution B.

In the above solution, the molar ratio between any two elements of iron, manganese and aluminum is in the range of 6:1˜1:6.

Add the mixed solution A into the mixed solution B solution for thorough mixing, or add the mixed solution B into the mixed solution A solution for thorough mixing, or add the mixed solution A and the mixed solution B into a container at the same time for mixing; the reaction time after mixing The range is 0.5min~5mm.

As an optimization, before mixing the mixed solution A and the mixed solution B, one or any ratio of sodium silicate, sodium polysilicate, sodium polyphosphate, sodium phosphate, polyacrylamide (PAM), etc. The mixture is added to Mixed Solution A and/or Mixed Solution B, and fully stirred to dissolve; and/or,

As an optimization, before mixing the mixed solution A and the mixed solution B, one or any mixture of diatomite, kaolin, red soil, red mud, clay and other components can be added to the mixed solution A and/or Mix Solution B and stir well.

2. Using in-situ preparation method to prepare in-situ composite metal oxide adsorbent for arsenic removal

Prepare mixed solution A and mixed solution B respectively in one of the following ways:

1) Mixing iron salt, aluminum salt and ferrous salt solution to obtain mixed solution A, using permanganate solution as mixed solution B;

2) Mixing aluminum salt and ferrous salt solution to obtain mixed solution A, mixing ferric salt and permanganate solution to obtain mixed solution B;

3) Mixing ferric salt and ferrous salt solution to obtain mixed solution A, mixing aluminum salt and permanganate solution to obtain mixed solution B;

4) Mix the ferrous salt solution to obtain a mixed solution A, and mix the aluminum salt, iron salt, and permanganate solutions to obtain a mixed solution B.

In the above solution, the molar ratio between any two elements of iron, manganese and aluminum is in the range of 6:1˜1:6.

Add the mixed solution A and the mixed solution B into the arsenic-containing water respectively, and the order of adding the two can be one of the following ways: first add the mixed solution A, and then add the mixed solution B; add the mixed solution first B, add mixed solution A after fully mixing; mixed solution A and mixed solution B are added at the same time and then fully mixed. If it is added separately, the time interval between adding mixed solution A and mixed solution B is 0.5min~2min.

As an optimization, before mixing the mixed solution A and the mixed solution B, one or any ratio of sodium silicate, sodium polysilicate, sodium polyphosphate, sodium phosphate, polyacrylamide (PAM), etc. The mixture is added to Mixed Solution A and/or Mixed Solution B, fully stirred and dissolved, and compounded with Mixed Solution A and/or Mixed Solution B; and/or,

As an optimization, before mixing the mixed solution A and the mixed solution B, one or any mixture of diatomite, kaolin, red soil, red mud, clay and other components can be added to the mixed solution A and/or Mixture B, and stir well, compound with Mixture A and/or Mixture B.

The application method of the in-situ-generated composite metal oxide arsenic-removing adsorbent (obtained by the ex-situ method) of the present invention: add the in-situ-generated composite metal oxide arsenic-removing adsorbent to the arsenic-containing water, and the dosage is 0.1mg/L ~5g/L, and then thoroughly mixed. Among them, when the concentration of arsenic in the raw water is high (total arsenic>0.5mg/L), it can also be treated by adding in-situ composite metal oxide arsenic removal adsorbent twice or more. After mixing and reacting for 0.5 to 5 minutes, the arsenic-containing water added with the in-situ-generated composite metal oxide arsenic-removing adsorbent enters the filter reactor for filtration.

The application method of the in-situ generated composite metal oxide arsenic-removing adsorbent (obtained by the in-situ method) of the present invention: add mixed solution A and/or mixed solution B to arsenic-containing water. Among them, the time interval between the dosing of the mixed solution A and the mixed solution B is 10S~2min; Between L. Among them, when the concentration of arsenic in the raw water is high (total arsenic>0.5mg/L), it can also be treated by sequentially adding mixed solution A or mixed solution B several times. After mixing and reacting for 0.5 to 5 minutes, the arsenic-containing water added with the in-situ-generated composite metal oxide arsenic-removing adsorbent enters the filter reactor for filtration.

For the filter reactor as described above, media filter is used for filtering. Filter medium The filter material can be one or a mixture of quartz sand, manganese sand, magnetite, anthracite, ceramsite, activated alumina, etc. The filter material particle size ranges from 0.4mm to 2mm, and the filler thickness ranges from 0.50m to 1.5m. The filtration velocity range of water flowing through the filtration reactor is between 2m/h and 15m/h. There is a support layer at the lower part of the filter medium filter material layer, and the support layer filler can be gravel, activated alumina, quartz sand, manganese sand, magnetite, anthracite, ceramsite, etc. The particle size of the supporting layer ranges from 2mm to 16mm, and the filler thickness ranges from 0.2m to 0.6m. The filtration rate of the arsenic-containing water passing through the filter reactor ranges from 2m/h to 15m/h.

The present invention further provides a reactor used in the arsenic removal process of the in-situ generated composite metal oxide adsorbent for arsenic removal (obtained by the in-situ preparation method) as shown in FIG. 1 . In this reactor, the dosing port of mixed solution A and mixed solution B is set in the arsenic-containing water pipeline, and a pipeline mixer is set after the medicine solution is added, and then enters the medium filtration unit for filtration.

The present invention further provides a reactor used in the arsenic removal process as shown in FIG. A dosing port for the in-situ generation of composite metal oxide arsenic-removing sorbent is set in the arsenic-containing water pipeline. After the sorbent is added, a pipeline mixer is set, and then it enters the filter reactor for filtration.

The technical effect that the present invention realizes is as follows:

The in-situ composite metal oxide arsenic-removing adsorbent involved in the present invention is prepared from common water treatment agents and/or materials, and has a simple preparation method, low cost, and easy operation. The arsenic-removing adsorbent involved in the invention has excellent arsenic-removing performance.

1. The preparation method of the in-situ composite metal oxide arsenic removal adsorbent is simple, the ex-situ preparation method is only to mix the mixed solution A and the mixed solution B, and the in-situ preparation method is only to mix the mixed solution A and the mixed solution B in sequence Adding to arsenic-containing water, the operation process is simple and easy to implement;

2. The mixed solution A and mixed solution B used in the preparation of the in-situ composite metal oxide arsenic-removing adsorbent are water purification agents or materials commonly used in water treatment, and the cost is low;

3. The arsenic removal process of the in-situ generated composite metal oxide arsenic removal adsorbent is realized through various methods such as interface oxidation, adsorption, surface complexation, chelation, adsorption, co-sedimentation, bridging, sweeping, etc., with abundant adsorption sites , a variety of mechanisms of action synergistically, thus having a good arsenic removal effect;

4. The application method of the in-situ generated composite metal oxide arsenic removal adsorbent is only to add the in-situ generated composite metal oxide arsenic removal adsorbent prepared in situ to the arsenic-containing water, or mix the mixed solution A with the mixed Liquid B is added to arsenic-containing water successively, and then fully mixed and filtered, and the construction operation process is simple;

5. The application of the in-situ composite metal oxide arsenic removal adsorbent can reduce the arsenic concentration in the water to the requirement for the concentration of arsenic in the third type of water in the national surface water environmental quality standard (<0.05mg/L);

6. The in-situ generation of composite metal oxide arsenic removal adsorbent can also be used to remove arsenic pollutants in lakes, reservoirs, rivers, groundwater, industrial wastewater and other water bodies;

7. In-situ generation of composite metal oxides In addition to removing arsenic in water, the arsenic adsorbent can also be used to adsorb and remove heavy metals such as copper, chromium, cadmium, lead, and pollutants such as iron, manganese, and phosphate in water.

Description of drawings

Fig. 1. Schematic diagram of the filter reactor used in the arsenic removal process of the in-situ generated composite metal oxide arsenic removal adsorbent (obtained by the in-situ method) of the present invention.

Fig. 2. A schematic diagram of a filter reactor used in the arsenic removal process of the in-situ generated composite metal oxide arsenic-removing adsorbent (obtained by an ex-situ method) of the present invention.

reference sign

figure 1

1. Arsenic-containing water inlet pipe 2. Dosing port A 3. Dosing port B

4. Medicine storage barrel A 5. Medicine storage barrel B 6. Pipeline mixer

7. Filtration reactor 8. Filter media layer 9. Supporting layer

10. Outlet pipe

figure 2

1. Arsenic-containing water inlet pipe 2. Dosing port A 3. Dosing port B

4. Medicine storage barrel A 5. Medicine storage barrel B 6. Pipeline mixer A

7. Pipeline mixer B 8. Filter reactor 9. Filter medium filter material layer

10. Supporting layer 11. Outlet pipe

Detailed ways

Example 1

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by an ex-situ preparation method. Prepare mixed solution A (ferric chloride, aluminum chloride, ferrous sulfate concentration is 2g/L) that is made up of ferric chloride, aluminum trichloride, ferrous sulfate solution in medicine storage barrel A; Prepare permanganate solution in barrel B as mixed solution B (concentration of permanganate is 1g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 2min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 10mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 15m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 2

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Preparation of mixed solution A consisting of aluminum trichloride and ferrous sulfate solution (both concentrations of aluminum trichloride and ferrous sulfate are 1g/L); preparation of mixed solution B consisting of ferric chloride and permanganate solution (Concentration of ferric chloride is 1g/L, concentration of permanganate is 0.5g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 2min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 10mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb and remove arsenic enters the filter reactor for filtration, and the filtration rate is 2m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 3

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Preparation of mixed solution A consisting of ferric chloride and ferrous sulfate solution (concentrations of ferric chloride and ferrous sulfate are both 3g/L); preparation of mixed solution B composed of aluminum chloride and permanganate solution (The concentration of aluminum chloride is 3g/L, and the concentration of permanganate is 1.5g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 2min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 10mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 10m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 4

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Preparation of mixed solution A (concentration of ferrous sulfate is 3g/L) composed of ferrous sulfate solution; preparation of mixed solution B (ferric chloride and aluminum chloride concentration are 3g/L, permanganate concentration is 1.5g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 2min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 10mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb and remove arsenic enters the filter reactor for filtration, and the filtration rate is 8m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 5

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Preparation of mixed solution A (concentration of ferric chloride and ferric sulfate is 1.5mg/L, concentration of ferrous sulfate is 3g/L;) composed of ferric chloride, ferric sulfate and ferrous sulfate solution; Mixed solution B composed of aluminum chloride, aluminum sulfate and permanganate solution (the concentration of aluminum trichloride and aluminum sulfate is 1.5g/L, and the concentration of permanganate is 1.5g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 3min, and the composite metal oxide is generated in situ to remove the arsenic. After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 6m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 6

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Preparation of mixed solution A composed of polyferric chloride and ferrous sulfate solution (the concentration of both polyferric chloride and ferrous sulfate is 3g/L); Mixed solution B (concentrations of aluminum trichloride and polyaluminum sulfate are both 1.5 g/L, and potassium permanganate concentration is 1.5 g/L) composed of solutions.

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.30mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 4min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 10mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 4m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 7

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare a mixed solution A consisting of ferric chloride, aluminum trichloride, ferrous sulfate, and manganese chloride solution (concentrations of ferric chloride, aluminum trichloride, ferrous sulfate, and manganese chloride are both 2 g/L) ; Prepare permanganate solution as mixed solution B (concentration of permanganate is 1g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.30mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 4min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 20mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 6m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 8

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare mixed solution A (ferric chloride, ferric sulfate, nitric acid Iron, aluminum trichloride, aluminum nitrate, aluminum sulfate, ferrous sulfate, manganese chloride, manganese sulfate solution are all 2g/L); Prepare permanganate solution as mixed solution B (permanganate concentration is 5g/L L). Add mixed solution B to mixed solution A, and stir for 10 minutes.

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.80mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 4min, and the composite metal oxide adsorbent for arsenic removal is generated in situ with an adsorption content of 40mg/L, and then contacted with arsenic-containing water and mixed through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 4m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 9

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare mixed solution A (ferric chloride, ferric sulfate, nitric acid Iron, aluminum trichloride, aluminum nitrate, aluminum sulfate, ferrous sulfate, manganese chloride, manganese sulfate solution are 2g/L); prepared by permanganate, polyaluminum chloride, polyferric sulfate, polyferric nitrate The solution was used as mixed solution B (the concentration of permanganate was 5 g/L, and the concentration of polyaluminum chloride, polyferric sulfate, and polyferric nitrate solution was 1 g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.15mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 4min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 10mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 12m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 10

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare mixed solution A (concentrations of ferric chloride, aluminum trichloride and ferrous sulfate are 2g/L, and the concentration of ferric chloride, aluminum chloride, ferrous sulfate is 2g/L, Calcium, magnesium chloride solution concentration is 0.5g/L); Prepare permanganate solution as mixed solution B (permanganate concentration is 1g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 4min, and the composite metal oxide is generated in situ to remove the arsenic adsorbent with an adsorption content of 20mg/L, and then contact with the arsenic-containing water, and mix through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb and remove arsenic enters the filter reactor for filtration, and the filtration rate is 8m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 11

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Preparation of mixed solution A consisting of ferric chloride, aluminum trichloride, ferrous sulfate, sodium silicate, sodium polysilicate, and sodium polyphosphate solution (concentrations of ferric chloride, aluminum trichloride, and ferrous sulfate are equal to 2g/L, sodium silicate, sodium polysilicate, sodium polyphosphate solution concentration is 0.5g/L); prepare permanganate solution as mixed solution B (permanganate concentration is 1g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.63mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 5min, and the composite metal oxide adsorbent for arsenic removal is generated in situ with an adsorption content of 40mg/L, and then contacted with arsenic-containing water and mixed through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 4m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 12

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare mixed solution A (concentrations of ferric chloride, aluminum trichloride and ferrous sulfate are 2g/L, silicic acid Sodium and PAM solution concentrations are 1g/L); prepare permanganate solution as mixed solution B (permanganate concentration is 4g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.63mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 5min, and the composite metal oxide adsorbent for arsenic removal is generated in situ with an adsorption content of 40mg/L, and then contacted with arsenic-containing water and mixed through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 4m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 13

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare mixed solution A (concentrations of ferric chloride, aluminum chloride and ferrous sulfate are 2g/L) consisting of ferric chloride, aluminum trichloride and ferrous sulfate solution; prepare permanganate, Mixed solution B composed of sodium silicate and PAM solution (the concentration of permanganate is 4g/L, and the concentration of sodium silicate and PAM solution is 1g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 0.63mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 5min, and the composite metal oxide adsorbent for arsenic removal is generated in situ with an adsorption content of 40mg/L, and then contacted with arsenic-containing water and mixed through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent adsorbs and removes arsenic enters the filter reactor for filtration, and the filtration rate is 5m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 14

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare ferric chloride, aluminum trichloride, ferrous sulfate solution (concentration of ferric chloride, aluminum trichloride, ferrous sulfate is 2g/L), and add diatomite, kaolin, red soil, pulverized coal Ash, red mud, clay (diatomaceous earth, kaolin, red soil, fly ash, red mud, clay concentration are all 5g/L) and stirred to obtain mixed solution A; prepared by permanganate, sodium silicate, PAM Mixed solution B of solution composition (permanganate concentration is 4g/L, sodium silicate and PAM solution concentration are 1g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 1.00mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 5min, and the composite metal oxide adsorbent for arsenic removal is generated in situ with an adsorption content of 65mg/L, and then contacted with arsenic-containing water and mixed through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb and remove arsenic enters the filter reactor for filtration, and the filtration rate is 3m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 15

Material preparation: The in-situ-generated composite metal oxide adsorbent for arsenic removal was prepared by ex-situ method. Prepare ferric chloride, aluminum trichloride, ferrous sulfate solution (concentration of ferric chloride, aluminum trichloride, ferrous sulfate is 2g/L), and add diatomite, kaolin (diatomite, The concentration of kaolin is 50g/L) and stirred and mixed to obtain mixed solution A; the preparation is made of permanganate, sodium silicate, PAM solution and added red soil, fly ash, red mud, clay, etc. and fully stirred to obtain mixed solution B (high The concentration of manganate is 4g/L, the concentration of sodium silicate and PAM solution is 1g/L, and the concentration of red soil, fly ash, red mud and clay is 50g/L).

Applied to the purification of arsenic-containing water: the concentration of arsenic in arsenic-polluted water is 1.00mg/L. Put the mixed solution A and the mixed solution B into the pipeline mixer A at the same time, the mixing reaction time is 5min, and the composite metal oxide adsorbent for arsenic removal is generated in situ with an adsorption content of 65mg/L, and then contacted with arsenic-containing water and mixed through the pipeline After fully mixing in device B, the arsenic-containing water after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb and remove arsenic enters the filter reactor for filtration, and the filtration rate is 3m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 16

The in-situ composite metal oxide adsorbent for arsenic removal was prepared by an in-situ method. Prepare mixed solution A (ferric chloride, aluminum chloride, ferrous sulfate concentration is 2g/L) that is formed by iron trichloride, aluminum trichloride, ferrous sulfate solution; Prepare permanganate solution as Mixed solution B (concentration of permanganate is 1g/L).

The concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A into the dosing port 2, 30s later, put the mixed solution B into the dosing port 3, the mixed solution A and the mixed solution B enter the pipeline mixer, the mixing reaction time is 2min, and the composite metal oxide is generated in situ Arsenic adsorbent adsorption, in-situ generation of composite metal oxide arsenic removal adsorbent, the adsorption capacity is 10mg/L, after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb arsenic, the arsenic-containing water enters the filter reactor for filtration, The filtration rate is 12m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 17

The in-situ composite metal oxide adsorbent for arsenic removal was prepared by an in-situ method. Prepare mixed solution A (ferric chloride, aluminum chloride, ferrous sulfate concentration is 2g/L) that is formed by iron trichloride, aluminum trichloride, ferrous sulfate solution; Prepare permanganate solution as Mixed solution B (concentration of permanganate is 1g/L).

The concentration of arsenic in arsenic-polluted water is 0.20mg/L. Put the mixed solution A into the dosing port 2, 30s later, put the mixed solution B into the dosing port 3, the mixed solution A and the mixed solution B enter the pipeline mixer, the mixing reaction time is 2min, and the composite metal oxide is generated in situ Arsenic adsorbent adsorption, in-situ generation of composite metal oxide arsenic removal adsorbent, the adsorption capacity is 10mg/L, after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb arsenic, the arsenic-containing water enters the filter reactor for filtration, The filtration rate is 12m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 18

The in-situ composite metal oxide adsorbent for arsenic removal was prepared by an in-situ method. Prepare mixed solution A (concentrations of ferric chloride, aluminum chloride and ferrous sulfate are 2g/L) consisting of ferric chloride, aluminum trichloride and ferrous sulfate solution; prepare permanganate, Mixed solution B composed of sodium silicate and PAM solution (the concentration of permanganate is 4g/L, and the concentration of sodium silicate and PAM solution is 1g/L).

The concentration of arsenic in arsenic-polluted water is 2.0mg/L. Put the mixed solution A into the dosing port 2, 10s later, put the mixed solution B into the dosing port 3, the mixed solution A and the mixed solution B enter the pipeline mixer, the mixing reaction time is 4min, and the composite metal oxide is generated in situ Arsenic adsorbent adsorption, in-situ generation of composite metal oxide arsenic removal adsorbent, the adsorption capacity is 20mg/L, after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb and remove arsenic, the arsenic-containing water enters the filter reactor for filtration, The filtration rate is 6m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 19

The in-situ composite metal oxide adsorbent for arsenic removal was prepared by an in-situ method. Prepare ferric chloride, aluminum trichloride, ferrous sulfate solution (concentration of ferric chloride, aluminum trichloride, ferrous sulfate is 2g/L), and add diatomite, kaolin, red soil, pulverized coal Ash, red mud, clay (diatomaceous earth, kaolin, red soil, fly ash, red mud, clay concentration are all 5g/L) and stirred to obtain mixed solution A; prepared by permanganate, sodium silicate, PAM Mixture B of solution composition (the concentration of permanganate is 4g/L, and the concentration of sodium silicate and PAM solution is 1g/L).

The concentration of arsenic in arsenic-polluted water is 2.0mg/L. Put the mixed solution A into the dosing port 2, 10s later, put the mixed solution B into the dosing port 3, the mixed solution A and the mixed solution B enter the pipeline mixer, the mixing reaction time is 5min, and the composite metal oxide is generated in situ Arsenic adsorbent adsorption, in-situ generation of composite metal oxide arsenic removal adsorbent, the adsorption capacity is 40mg/L, after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb arsenic, the arsenic-containing water enters the filter reactor for filtration, The filtration rate is 2m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 20

The in-situ composite metal oxide adsorbent for arsenic removal was prepared by an in-situ method. Prepare ferric chloride, aluminum trichloride, ferrous sulfate solution (concentration of ferric chloride, aluminum trichloride, ferrous sulfate is 2g/L), and add diatomite, kaolin (diatomite, The concentration of kaolin is 50g/L) and stirred and mixed to obtain mixed solution A; the preparation is made of permanganate, sodium silicate, PAM solution and added red soil, fly ash, red mud, clay, etc. and fully stirred to obtain mixed solution B (high The concentration of manganate is 4g/L, the concentration of sodium silicate and PAM solution is 1g/L, and the concentration of red soil, fly ash, red mud and clay is 50g/L).

The concentration of arsenic in arsenic-polluted water is 2.0mg/L. Put the mixed solution A into the dosing port 2, 10s later, put the mixed solution B into the dosing port 3, the mixed solution A and the mixed solution B enter the pipeline mixer, the mixing reaction time is 4min, and the composite metal oxide is generated in situ Arsenic adsorbent adsorption, in-situ generation of composite metal oxide arsenic removal adsorbent, the adsorption capacity is 50 mg/L, after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb arsenic, the arsenic-containing water enters the filter reactor for filtration, The filtration rate is 3m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Example 21

The in-situ composite metal oxide adsorbent for arsenic removal was prepared by an in-situ method. Prepare ferric chloride, aluminum trichloride, ferrous sulfate solution (concentration of ferric chloride, aluminum trichloride, ferrous sulfate is 2g/L), and add diatomite, kaolin (diatomite, The concentration of kaolin is 50g/L) and stirred and mixed to obtain mixed solution A; the preparation is made of permanganate, sodium silicate, PAM solution and added red soil, fly ash, red mud, clay, etc. and fully stirred to obtain mixed solution B (high The concentration of manganate is 4g/L, the concentration of sodium silicate and PAM solution is 1g/L, and the concentration of red soil, fly ash, red mud and clay is 50g/L).

The concentration of arsenic in arsenic-polluted water is 1.0mg/L. Put the mixed solution A into the dosing port 2, 10s later, put the mixed solution B into the dosing port 3, the mixed solution A and the mixed solution B enter the pipeline mixer, the mixing reaction time is 3min, and the composite metal oxide is generated in situ Arsenic adsorbent adsorption, in-situ generation of composite metal oxide arsenic removal adsorbent, the adsorption capacity is 25mg/L, after the in-situ generation of composite metal oxide arsenic removal adsorbent to absorb and remove arsenic, the arsenic-containing water enters the filter reactor for filtration, The filtration rate is 8m/h. The concentration of arsenic in the effluent of the filter reactor meets the requirements for the concentration of arsenic in third-class water bodies of the national surface water environmental quality standard (<0.05mg/L).

Claims (10)

1. An in-situ composite metal oxide arsenic-removing adsorbent is characterized in that the composite components include hydrated iron oxide, hydrated iron hydroxide, hydrated iron hydroxyhydroxide, hydrated aluminum oxide, hydrated aluminum oxyhydroxide , hydrated aluminum hydroxide, hydrated manganese oxide, hydrated manganese hydroxyhydroxide, and prepared by in-situ reaction. 2. The in-situ composite metal oxide arsenic-removing adsorbent according to claim 1 is characterized in that it is prepared by chemical reaction from iron salt solution, aluminum salt solution, ferrous salt solution, and permanganate solution . 3. The in-situ generation composite metal oxide arsenic-removing adsorbent according to claim 2, wherein the iron salt solution is selected from ferric chloride, ferric sulfate, ferric nitrate, polyferric chloride, polysulfuric acid One or more mixed salts of iron and polyferric nitrate; The aluminum salt solution is selected from one or more mixtures of aluminum sulfate, aluminum chloride, polyaluminum sulfate, polyaluminum chloride, aluminum nitrate, polyaluminum nitrate, and alum solutions; Described ferrous salt solution is selected from one or more mixtures in ferrous chloride, ferrous sulfate, ferrous nitrate solution; The permanganate solution is selected from one or more mixtures of potassium permanganate and sodium permanganate solutions. 4. The in-situ composite metal oxide arsenic-removing adsorbent according to claim 2 is characterized in that calcium salt is added to the above-mentioned aluminum salt solution, iron salt solution, ferrous salt solution and permanganate solution , one or more mixed salt solutions of magnesium salts; the ratio of the moles of calcium salts to the moles of aluminum salts or iron salts, ferrous salts, and permanganates is 0 to 1:1, and magnesium salts The ratio of the moles of aluminum salts or iron salts, ferrous salts, and permanganates is 0 to 1:1; Add manganese salt solution to above-mentioned aluminum salt solution, iron salt solution, ferrous salt solution, the ratio of the molar number of manganese salt to the molar number of aluminum salt or iron salt, ferrous salt, permanganate is 0～2 : 1. 5. The in-situ generation composite metal oxide arsenic-removing adsorbent according to claim 4, wherein the calcium salt is selected from one or more of calcium chloride, calcium sulfate, and calcium nitrate mixed salt; The magnesium salt is selected from one or more mixed salts of magnesium chloride, magnesium sulfate, and magnesium nitrate; The iron salt is selected from one or more mixed salts of ferric chloride, ferric sulfate and ferric nitrate; The manganese salt is selected from one or more mixed salts of manganese chloride, manganese sulfate and manganese nitrate. 6. The in-situ generation composite metal oxide arsenic-removing adsorbent according to claim 1, characterized in that the composite metal oxide arsenic-removing adsorbent is compounded with sodium silicate, sodium polyphosphate, sodium phosphate, and polyacrylamide , the mass ratio of any one of sodium silicate, sodium polyphosphate, sodium phosphate, polyacrylamide to aluminum salt or iron salt, ferrous salt, permanganate is 0-0.5:1. 7. The in-situ generation composite metal oxide arsenic-removing adsorbent according to claim 1 is characterized in that the composite metal oxide arsenic-removing adsorbent is compounded with diatomite, kaolin, red soil, red mud, clay, silicon The mass ratio of any one of algae earth, kaolin, red soil, red mud and clay to aluminum salt or iron salt, ferrous salt and permanganate is 0-1000:1. 8. A method for preparing the in-situ composite metal oxide arsenic-removing adsorbent according to any one of claims 1 to 7, which is prepared by an ex-situ preparation method or an in-situ preparation method, characterized in that : First prepare mixed solution A and mixed solution B, and mixed solution A and mixed solution B are obtained in one of the following ways: 1) Mixing iron salt, aluminum salt and ferrous salt solution to obtain mixed solution A, using permanganate solution as mixed solution B; or, 2) Mixing aluminum salt and ferrous salt solution to obtain mixed solution A, mixing ferric salt and permanganate solution to obtain mixed solution B; or, 3) Mixing iron salt and ferrous salt solution to obtain mixed solution A, mixing aluminum salt and permanganate solution to obtain mixed solution B; or, 4) Mixing the ferrous salt solution to obtain a mixed solution A, and mixing the aluminum salt, iron salt, and permanganate solutions to obtain a mixed solution B; In the above solution, the molar ratio between any two elements of iron, manganese and aluminum is in the range of 6:1 to 1:6; When using the ex-situ preparation method to prepare the composite metal oxide arsenic-removing adsorbent, the mixed solution A is added to the mixed solution B solution to fully mix, or the mixed solution B is added to the mixed solution A solution to be fully mixed, or the mixed solution A and mixed liquid B are added into a container for mixing at the same time; the mixing reaction time ranges from 0.5min to 5min; When using the in-situ preparation method to prepare the composite metal oxide arsenic-removing adsorbent, the mixed solution A and the mixed solution B are respectively added to the arsenic-containing water, and the order of the two additions is one of the following methods: the mixed solution is added first A, add mixed solution B after fully mixing; add mixed solution B first, then add mixed solution A after fully mixed; mixed solution A and mixed solution B are added at the same time and then fully mixed; when mixed solution A and mixed solution B are not When adding at the same time, the time interval between adding mixed solution A and mixed solution B is 10s~60s. 9. An application method of an in-situ composite metal oxide arsenic removal sorbent obtained by the method as claimed in claim 8, characterized in that, the composite metal oxide arsenic removal sorbent obtained by an ectopic preparation method is used for In application, add composite metal oxide arsenic-removing adsorbent in arsenic-containing water, the dosage is between 0.1mg/L-5g/L, and then fully mix; Among them, when the arsenic concentration in the raw water is greater than 0.5mg/L, it is treated by adding the composite metal oxide arsenic removal adsorbent twice or more; The arsenic-containing water after removing the arsenic adsorbent enters the filter reactor for filtration, and the filtered water flows out after reaching the sanitary standard for drinking water. 10. An application method of the in-situ generation composite metal oxide arsenic removal adsorbent obtained by the method as claimed in claim 8, characterized in that, the composite metal oxide arsenic removal adsorbent obtained by the in-situ preparation method is used for In application, add mixed solution A and mixed solution B in arsenic-containing water; Among them, the time interval between the addition of mixed solution A and mixed solution B is 10s~60s; the dosage of composite metal oxide arsenic removal adsorbent obtained by the reaction of mixed solution A and mixed solution B is between 0.5mg/L～5g/L ; Among them, when the arsenic concentration in the raw water is greater than 0.5mg/L, the method of adding mixed solution A or mixed solution B in sequence for multiple times is used for treatment; after the mixed reaction for 1min to 5min, the composite metal oxide arsenic-removing adsorbent is added Afterwards, the arsenic-containing water enters the filter reactor for filtration, and the filtered water flows out after reaching the sanitary standard for drinking water.

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